adding back run2_miniAOD_UL_preSummer20 process modifier for UL preSummer20 AOD samples

Author: vlimant

Configuration/ProcessModifiers/python/run2_miniAOD_UL_preSummer20_cff.py

@@ -0,0 +1,10 @@
+import FWCore.ParameterSet.Config as cms
+
+from Configuration.ProcessModifiers.run2_miniAOD_UL_cff import run2_miniAOD_UL
+from Configuration.ProcessModifiers.miniAOD_skip_trackExtras_cff import miniAOD_skip_trackExtras
+
+# This modifier is for additional settings to run miniAOD on top of 
+# ultra-legacy (during LS2) Run-2 AOD produced prior to the Summer20
+# campaign where AOD event content was extended
+
+run2_miniAOD_UL_preSummer20 = cms.ModifierChain(run2_miniAOD_UL, miniAOD_skip_trackExtras)